UBUNTU-CVE-2021-23840

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    UBUNTU-CVE-2021-23840

    Published: 16 Feb 2021Last Modified: 27 Apr 2026
    Upstream:
    CVE-2021-23840

    Summary:

    Details: Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate may overflow the output length argument in some cases where the input length is close to the maximum permissable length for an integer on the platform. In such cases the return value from the function call will be 1 (indicating success), but the output length value will be negative. This could cause applications to behave incorrectly or crash. OpenSSL versions 1.1.1i and below are affected by this issue. Users of these versions should upgrade to OpenSSL 1.1.1j. OpenSSL versions 1.0.2x and below are affected by this issue. However OpenSSL 1.0.2 is out of support and no longer receiving public updates. Premium support customers of OpenSSL 1.0.2 should upgrade to 1.0.2y. Other users should upgrade to 1.1.1j. Fixed in OpenSSL 1.1.1j (Affected 1.1.1-1.1.1i). Fixed in OpenSSL 1.0.2y (Affected 1.0.2-1.0.2x).

    References: https://ubuntu.com/security/CVE-2021-23840, https://www.openssl.org/news/secadv/20210216.txt, https://ubuntu.com/security/notices/USN-4738-1, https://ubuntu.com/security/notices/USN-5088-1, https://www.cve.org/CVERecord?id=CVE-2021-23840, https://ubuntu.com/security/notices/USN-7018-1

    Affected packages

    Package

    Name: openssl

    Purl: pkg:deb/ubuntu/[email protected]+esm10?arch=source&distro=trusty/esm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.0.1f-1ubuntu2.27+esm10

    Affected versions

    1.0.1e-3ubuntu1
    1.0.1e-4ubuntu1
    1.0.1e-4ubuntu2
    1.0.1e-4ubuntu3
    1.0.1e-4ubuntu4
    1.0.1f-1ubuntu1
    1.0.1f-1ubuntu2
    1.0.1f-1ubuntu2.1
    1.0.1f-1ubuntu2.2
    1.0.1f-1ubuntu2.3
    1.0.1f-1ubuntu2.4
    1.0.1f-1ubuntu2.5
    1.0.1f-1ubuntu2.7
    1.0.1f-1ubuntu2.8
    1.0.1f-1ubuntu2.11
    1.0.1f-1ubuntu2.12
    1.0.1f-1ubuntu2.15
    1.0.1f-1ubuntu2.16
    1.0.1f-1ubuntu2.17
    1.0.1f-1ubuntu2.18
    1.0.1f-1ubuntu2.19
    1.0.1f-1ubuntu2.20
    1.0.1f-1ubuntu2.21
    1.0.1f-1ubuntu2.22
    1.0.1f-1ubuntu2.23
    1.0.1f-1ubuntu2.24
    1.0.1f-1ubuntu2.25
    1.0.1f-1ubuntu2.26
    1.0.1f-1ubuntu2.27
    1.0.1f-1ubuntu2.27+esm1
    1.0.1f-1ubuntu2.27+esm2
    1.0.1f-1ubuntu2.27+esm3
    1.0.1f-1ubuntu2.27+esm4
    1.0.1f-1ubuntu2.27+esm5
    1.0.1f-1ubuntu2.27+esm6
    1.0.1f-1ubuntu2.27+esm7
    1.0.1f-1ubuntu2.27+esm9

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2021-23840 | CVE-DB